High Pressure Seamless Boiler Alloy Steel Pipe ASME SA335 P11, P22, P91, P12, P92, P5, P9
1. Product Description: High Pressure Seamless Boiler Alloy Steel Pipe ASME SA335 P11, P22, P91, P12, P92, P5, and P9 are premium-grade alloy steel pipes designed for applications requiring exceptional strength and resistance to high temperatures and pressures. These seamless pipes are manufactured to the ASME SA335 standard, which ensures their suitability for use in boiler, superheater, and heat exchanger applications.
2. Product Parameters:
| Parameter | Description |
| Grades | ASME SA335 P11, P22, P91, P12, P92, P5, P9 |
| Material | Alloy Steel (Seamless) |
| Standard | ASME SA335 |
| Size Range | Various diameters and wall thicknesses as per ASME SA335 |
| Length | Standard lengths, customizable upon request |
| Ends | Plain ends, beveled ends, threaded, or socket-weld ends |
| Surface Treatment | As-rolled, annealed, or normalized |
3. Mechanical Properties:
| Property | Requirement by Grade |
| Tensile Strength | Varies by grade, typically from ≥415 MPa to ≥620 MPa (60,000 to 90,000 psi) |
| Yield Strength | Varies by grade, typically from ≥205 MPa to ≥415 MPa (30,000 to 60,000 psi) |
| Elongation | Typically ≥20% in 50 mm (2 in) or 4D, whichever is greater |
| Hardness | Varies depending on heat treatment and specific grade |
4. Chemical Composition:
| Element | Typical Range (%) by Grade (Examples) |
| Carbon | Varies, e.g., P11: 0.05-0.15 |
| Chromium | Some grades contain chromium, e.g., P91: 8.00-9.50 |
| Molybdenum | Varies, e.g., P22: 0.40-0.50 |
| Phosphorus | ≤ 0.025 (common across grades) |
| Sulfur | ≤ 0.025 (common across grades) |
| Silicon | Typically ≤ 0.50 |
5. Product Uses:
- Boiler Tubes: Used for steam generation in high-pressure boilers.
- Superheater Tubes: Employed in superheater sections to raise steam temperature.
- Heat Exchangers: Suitable for use in heat exchangers operating under high pressure and temperature.
- Pressure Vessels: Ideal for construction of high-pressure vessels and reactors in various industries.
6. Product Grade Standards:
- ASME SA335: This standard specifies the requirements for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. The grades P11, P22, P91, P12, P92, P5, and P9 are particularly designed to offer varying levels of strength and temperature resistance.
Conclusion: High Pressure Seamless Boiler Alloy Steel Pipe ASME SA335 P11, P22, P91, P12, P92, P5, and P9 are engineered to provide a combination of high strength, ductility, and corrosion resistance suitable for extreme thermal conditions. Their seamless construction and adherence to ASME SA335 standards ensure reliability and durability for critical applications in the power and industrial sectors.
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